here. mei xiang by all accounts was doing a terrific job as a mother. then on sunday, 9:00 a.m., that is the last time that zoo officials heard any kind of noise from the baby cub here. a short time later, 9:17, that's when mei xiang let out a distress call, and zoo officials realized that something was terribly wrong. the zoo staff was able to get in there about an hour later, and they took a look at the cub. unfortunately, the cub was not breathing at that point. they tried to resuscitate the cub but had no success. the big question, of course, is what happened. we're hoping to learn more later on this morning. as for mei xiang, she is still inside the panda house, and she's under constant surveillance. >> right now mei is on 24-hour watch. she's our primary concern. we need to make sure she's very well taken care of. people can watch her, if they want, on the panda cam still, and we have to think about what's next. as everybody knows, pandas come into breeding season once a year.